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Finding the Fourth Proportional to 289.72, 398.94 and 227.80

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Solution

The fourth proportional to 289.72, 398.94 and 227.80 is: 313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.72 : 398.94 = 227.80 : x
  2. Step 2: Convert to fraction form
    289.72/398.94 = 227.80/x
  3. Step 3: Cross multiply
    289.72x = 398.94 × 227.80
  4. Step 4: Simplify right side
    289.72x = 90,878.53
  5. Step 5: Solve for x
    x = 90,878.53/289.72
  6. Step 6: Final answer
    x = 313.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.